NGC 6992 "Eastern Veil"

Finally became the owner of plugins from RC-Astro nxt bxt sxt, trying to do processing entirely in siril, of course there's a lot I don't know there, for example where the masks are and how to work with them, and it's unusual that you can't open multiple files, but these are all minor things, for now I'll use siril and pix, then in time I'll figure out what's what in this siril)